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<h1>Angle bisector</h1>

<p>This tool is an alternative to the <a href="../basicediting/ruler.html">Ruler</a>. Like the <a href="planethrough.html">Plane through 3 points</a> tool, 'Angle bisector' requires the user to select 3 points in the Crease Pattern. It will then determine the plane that is perpendicular to the triangle spanned by the three points and bisects the angle at the <b>second</b> point.
<p>If the selected points are on the same line, an error message will appear.
<p>'Angle bisector' can be enabled by clicking the <img src="anglebisector/01.png"> button.
<p>The <a href="../basicediting/snap.html">Snap</a> option works with this tool as well, but it will not display the small black squares seen on the <a href="../basicediting/3dview.html">3D View</a>.

<h2>Exercise</h2>
<ol>
<li>Start with a new piece of paper by going to <b>File > New > Square origami</b>.</li>
<li>With Snap enabled, you can easily bisect the angle at the top right corner:
<center><img src="anglebisector/02.png" width="60%" ></center>
However, you would have a hard time bisecting that angle once again with just the Ruler.</li>
<li>Instead, click the <img src="anglebisector/01.png"> button, and click the bottom left corner, then the top left corner, finally the bottom right corner:
<center><img src="anglebisector/03.png" width="60%" ></center></li>
<li><b>Right click</b> on the 3D View, and select <b>Reflect</b>.
<center><img src="anglebisector/04.png" width="60%" ></center></li>
<li>The 45&deg; angle at the top right corner has been properly bisected.
<center><img src="anglebisector/05.png" width="60%" ></center></li>
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